A car battery of emf $$12~\text{V}$$ and internal resistance $$5\times 10^{-2}~\Omega$$ receives a current of $$60~\text{A}$$ from an external source. The terminal voltage of the battery is: 1. $$12~\text{V}$$ 2. $$9~\text{V}$$ 3. $$15~\text{V}$$ 4. $$20~\text{V}$$

Subtopic:  EMF & Terminal Voltage |
51%
From NCERT
AIPMT - 2000
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If there are two bulbs of ($$40~\text{W},200~\text{V}$$), and ($$100~\text{W},200~\text{V}$$), then the correct relation for their resistance is:
1. $$R_{40}<R_{100}$$
2. $$R_{40}>R_{100}$$
3. $$R_{40}=R_{100}$$
4. no relation can be predicted

Subtopic:  Heating Effects of Current |
87%
From NCERT
AIPMT - 2000
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When three identical bulbs are connected in series, the consumed power is $$10$$ W. If they are now connected in parallel then the consumed power will be:
1. $$30$$ W
2. $$90$$ W
3. $$\frac{10}{3}$$ W
4. $$270$$ W

Subtopic:  Heating Effects of Current |
67%
From NCERT
AIPMT - 1998
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According to the Faraday Law of electrolysis, the mass deposited at electrode will be proportional to:

1. m ∝ I2

2. m ∝ Q

3. m ∝ Q2

4. 'm' does not depend on Q

Subtopic:  Current & Current Density |
72%
From NCERT
AIPMT - 2000
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In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by $$5^{\circ}$$ C. If the value of the current is doubled, then the increase in temperature will be:
1. $$15^{\circ}$$ C
2. $$20^{\circ}$$ C
3. $$25^{\circ}$$ C
4. $$30^{\circ}$$ C

Subtopic:  Heating Effects of Current |
68%
From NCERT
AIPMT - 1998
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The potentiometer is best for measuring voltage, as:

1. It has a sensitive galvanometer
2. It has wire of high resistance
3. It measures p.d. like in closed circuit
4. It measures p.d. like in open circuit

Subtopic:  Meter Bridge & Potentiometer |
From NCERT
AIPMT - 2000
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When three identical bulbs of $$60$$ watts and $$200$$-volt rating are connected in series to a $$200$$-volt supply, the power drawn by them will be:
1. $$180$$ watts
2. $$10$$ watts
3. $$20$$ watts
4. $$60$$ watts

Subtopic:  Heating Effects of Current |
73%
From NCERT
AIPMT - 2004
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The electric resistance of a particular wire of iron is R. If its length and radius are doubled, then:

 1 The resistance will be halved and the specific resistance will remain unchanged 2 The resistance will be halved and the specific resistance will be doubled 3 The resistance and the specific resistance, will both remain unchanged 4 The resistance will be doubled and the specific resistance will be halved
Subtopic:  Combination of Resistors |
82%
From NCERT
AIPMT - 2004
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Resistances $$n$$, each of $$r$$ ohm, when connected in parallel give an equivalent resistance of $$R$$ ohm. If these resistances were connected in series, the combination would have resistance in ohms, equal to:
1. $$\dfrac{R}{n^2}$$
2. $$\dfrac{R}{n}$$
3. $$nR$$
4. $$n^2R$$

Subtopic:  Combination of Resistors |
79%
From NCERT
AIPMT - 2004
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The current in $$8~\Omega$$ resistance is (in the figure below):

1. $$0.69$$ A
2. $$0.92$$ A
3. $$1.30$$ A
4. $$1.6$$ A

Subtopic:  Kirchoff's Voltage Law |
56%
From NCERT
AIPMT - 1999
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